某型直升机发动机尾喷管前转接段模态分析  

Mode Analysis of Reset Section before the Nozzle of Some Certain Type of Engineer of Helicopter

作　　者：刘将辉[1] 李本威[1] 贺孝涛[2] 黄帅 杜振宾[1] 李冬[1] 

机构地区：[1]海军航空工程学院飞行器工程系,山东烟台264001 [2]海军驻西安地区航空军事代表室,西安710021 [3]海军驻常州地区航空军事代表室,江苏常州213022

出　　处：《海军航空工程学院学报》2012年第2期161-165,共5页Journal of Naval Aeronautical and Astronautical University

摘　　要：某型直升机发动机出现的尾喷管裂纹故障主要发生在尾喷管前转接段焊缝周围。为分析故障原因,文章建立了该型发动机尾喷管结构的计算模型。对该型喷管整体结构进行了自由振动和模态分析,获得了该喷管模型的多阶自振频率和模态。将有限元分析结果和实验结果对比表明,两者所得的固有频率吻合性较好。Small cracks appeared in some certain type of engine＇s jet nozzle of helicopter recently,the trouble chiefly occurs around the reset section welding seam before the jet nozzle.In this paper,based on a jet nozzle structure in the engine,a calculation model was developed.The numerical results of free vibration frequencies and modes were also obtained through analyzing the integrated jet nozzle structure.Mutual comparison showed that the results of FEA estimation were in good agreement with those of testing.

关 键 词：尾喷管 前转接段 自由振动 喷管模态分析 

分 类 号：V235.113[航空宇航科学与技术—航空宇航推进理论与工程]